mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-28 20:02:17 +00:00
![Eric Biggers](/assets/img/avatar_default.png)
blk_crypto_evict_key() is only called in contexts such as inode eviction where failure is not an option. So there is nothing the caller can do with errors except log them. (dm-table.c does "use" the error code, but only to pass on to upper layers, so it doesn't really count.) Just make blk_crypto_evict_key() return void and log errors itself. Cc: stable@vger.kernel.org Signed-off-by: Eric Biggers <ebiggers@google.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20230315183907.53675-2-ebiggers@kernel.org Signed-off-by: Jens Axboe <axboe@kernel.dk>
135 lines
4.1 KiB
C
135 lines
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
/*
|
|
* Copyright 2019 Google LLC
|
|
*/
|
|
|
|
#ifndef __LINUX_BLK_CRYPTO_H
|
|
#define __LINUX_BLK_CRYPTO_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
enum blk_crypto_mode_num {
|
|
BLK_ENCRYPTION_MODE_INVALID,
|
|
BLK_ENCRYPTION_MODE_AES_256_XTS,
|
|
BLK_ENCRYPTION_MODE_AES_128_CBC_ESSIV,
|
|
BLK_ENCRYPTION_MODE_ADIANTUM,
|
|
BLK_ENCRYPTION_MODE_SM4_XTS,
|
|
BLK_ENCRYPTION_MODE_MAX,
|
|
};
|
|
|
|
#define BLK_CRYPTO_MAX_KEY_SIZE 64
|
|
/**
|
|
* struct blk_crypto_config - an inline encryption key's crypto configuration
|
|
* @crypto_mode: encryption algorithm this key is for
|
|
* @data_unit_size: the data unit size for all encryption/decryptions with this
|
|
* key. This is the size in bytes of each individual plaintext and
|
|
* ciphertext. This is always a power of 2. It might be e.g. the
|
|
* filesystem block size or the disk sector size.
|
|
* @dun_bytes: the maximum number of bytes of DUN used when using this key
|
|
*/
|
|
struct blk_crypto_config {
|
|
enum blk_crypto_mode_num crypto_mode;
|
|
unsigned int data_unit_size;
|
|
unsigned int dun_bytes;
|
|
};
|
|
|
|
/**
|
|
* struct blk_crypto_key - an inline encryption key
|
|
* @crypto_cfg: the crypto configuration (like crypto_mode, key size) for this
|
|
* key
|
|
* @data_unit_size_bits: log2 of data_unit_size
|
|
* @size: size of this key in bytes (determined by @crypto_cfg.crypto_mode)
|
|
* @raw: the raw bytes of this key. Only the first @size bytes are used.
|
|
*
|
|
* A blk_crypto_key is immutable once created, and many bios can reference it at
|
|
* the same time. It must not be freed until all bios using it have completed
|
|
* and it has been evicted from all devices on which it may have been used.
|
|
*/
|
|
struct blk_crypto_key {
|
|
struct blk_crypto_config crypto_cfg;
|
|
unsigned int data_unit_size_bits;
|
|
unsigned int size;
|
|
u8 raw[BLK_CRYPTO_MAX_KEY_SIZE];
|
|
};
|
|
|
|
#define BLK_CRYPTO_MAX_IV_SIZE 32
|
|
#define BLK_CRYPTO_DUN_ARRAY_SIZE (BLK_CRYPTO_MAX_IV_SIZE / sizeof(u64))
|
|
|
|
/**
|
|
* struct bio_crypt_ctx - an inline encryption context
|
|
* @bc_key: the key, algorithm, and data unit size to use
|
|
* @bc_dun: the data unit number (starting IV) to use
|
|
*
|
|
* A bio_crypt_ctx specifies that the contents of the bio will be encrypted (for
|
|
* write requests) or decrypted (for read requests) inline by the storage device
|
|
* or controller, or by the crypto API fallback.
|
|
*/
|
|
struct bio_crypt_ctx {
|
|
const struct blk_crypto_key *bc_key;
|
|
u64 bc_dun[BLK_CRYPTO_DUN_ARRAY_SIZE];
|
|
};
|
|
|
|
#include <linux/blk_types.h>
|
|
#include <linux/blkdev.h>
|
|
|
|
#ifdef CONFIG_BLK_INLINE_ENCRYPTION
|
|
|
|
static inline bool bio_has_crypt_ctx(struct bio *bio)
|
|
{
|
|
return bio->bi_crypt_context;
|
|
}
|
|
|
|
void bio_crypt_set_ctx(struct bio *bio, const struct blk_crypto_key *key,
|
|
const u64 dun[BLK_CRYPTO_DUN_ARRAY_SIZE],
|
|
gfp_t gfp_mask);
|
|
|
|
bool bio_crypt_dun_is_contiguous(const struct bio_crypt_ctx *bc,
|
|
unsigned int bytes,
|
|
const u64 next_dun[BLK_CRYPTO_DUN_ARRAY_SIZE]);
|
|
|
|
int blk_crypto_init_key(struct blk_crypto_key *blk_key, const u8 *raw_key,
|
|
enum blk_crypto_mode_num crypto_mode,
|
|
unsigned int dun_bytes,
|
|
unsigned int data_unit_size);
|
|
|
|
int blk_crypto_start_using_key(struct block_device *bdev,
|
|
const struct blk_crypto_key *key);
|
|
|
|
void blk_crypto_evict_key(struct block_device *bdev,
|
|
const struct blk_crypto_key *key);
|
|
|
|
bool blk_crypto_config_supported_natively(struct block_device *bdev,
|
|
const struct blk_crypto_config *cfg);
|
|
bool blk_crypto_config_supported(struct block_device *bdev,
|
|
const struct blk_crypto_config *cfg);
|
|
|
|
#else /* CONFIG_BLK_INLINE_ENCRYPTION */
|
|
|
|
static inline bool bio_has_crypt_ctx(struct bio *bio)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
#endif /* CONFIG_BLK_INLINE_ENCRYPTION */
|
|
|
|
int __bio_crypt_clone(struct bio *dst, struct bio *src, gfp_t gfp_mask);
|
|
/**
|
|
* bio_crypt_clone - clone bio encryption context
|
|
* @dst: destination bio
|
|
* @src: source bio
|
|
* @gfp_mask: memory allocation flags
|
|
*
|
|
* If @src has an encryption context, clone it to @dst.
|
|
*
|
|
* Return: 0 on success, -ENOMEM if out of memory. -ENOMEM is only possible if
|
|
* @gfp_mask doesn't include %__GFP_DIRECT_RECLAIM.
|
|
*/
|
|
static inline int bio_crypt_clone(struct bio *dst, struct bio *src,
|
|
gfp_t gfp_mask)
|
|
{
|
|
if (bio_has_crypt_ctx(src))
|
|
return __bio_crypt_clone(dst, src, gfp_mask);
|
|
return 0;
|
|
}
|
|
|
|
#endif /* __LINUX_BLK_CRYPTO_H */
|